JQuery - URL leer parametros

1ro definir la función:

$.urlParam = function (name) {

var results = new RegExp('[\\?&]' + name + '=([^&#]*)').exec(window.location.href);

if (results != null)

return results[1] || 0;

else

return results;

//return results != null ? results[1] || 0 : results;

}

2do: utilizar la función

if ($.urlParam('pk') != null) {
alert(pk);
}